package com.ithaodong.common.utils;

import com.ithaodong.common.exception.LeaseException;
import com.ithaodong.common.result.ResultCodeEnum;
import io.jsonwebtoken.*;
import io.jsonwebtoken.security.Keys;
import org.springframework.http.converter.json.GsonBuilderUtils;

import javax.crypto.SecretKey;
import java.util.Date;

public class JwtUtil {

    private static long tokenExpiration = 60 * 60 * 1000L;
    private static SecretKey tokenSignKey = Keys.hmacShaKeyFor("M0PKKI6pYGVWWfDZw90a0lTpGYX1d4AQ".getBytes());

    /**
     * 生成token
     * @param userId
     * @param username
     * @return
     */
    public static String createToken(Long userId, String username) {
        String token = Jwts.builder().
                setSubject("LOGIN_USER").
                setExpiration(new Date(System.currentTimeMillis() + tokenExpiration)).
                claim("userId", userId).
                claim("username", username).
                signWith(tokenSignKey, SignatureAlgorithm.HS256).
                compact();
        return token;
    }

    /**
     * 解析token
     * @param token
     * @return
     */
    public static Claims parseToken(String token) {

        if (token == null) {
            throw new LeaseException(ResultCodeEnum.ADMIN_LOGIN_AUTH);
        }

        try {
            JwtParser jwtParser = Jwts.parserBuilder()
                    .setSigningKey(tokenSignKey)
                    .build();
           return jwtParser.parseClaimsJws(token).getBody();

        } catch (ExpiredJwtException e) {
            throw new LeaseException(ResultCodeEnum.TOKEN_EXPIRED);
        } catch (JwtException e) {
            throw new LeaseException(ResultCodeEnum.TOKEN_INVALID);
        }
    }
}